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I have a 928Motorsports radiator, been on the car for over 5 years, no issues. Runs cooler, fits perfectly.
Keeping the Behr just in case,needs tank seals. The welds are beautiful, really a work of art. Don't know who is building them for Carl, but they are great so far. Dave |
The stock units can be rebuilt.
Rog has the end tanks at a reasonable rate. When I take them apart I blast out each and every channel to ensure that I have maximum cooling when I put them back together. If the core has a channel that leaked, I figure out which one has the hole and then take only that one channel out of service. Pretty easy to do to. :) Though the new units are definitely nice! |
Originally Posted by Rob M Budd
(Post 10529401)
After several failures of aluminum radiators, I had one made from copper/brass several years ago for my 80 928. Fit like a glove, never leaked, about the same weight as a new aluminum one.
The fabricator said if it ever had issues, it could be re-cored, soldered, or whatever by any good radiator shop. I tried to get the shop to make more of them but due to new management and resulting issues the design was lost. The 80 928 was sold to a fellow Rennlister a few years ago. I'd wager its still intact. If my 91 ever needs a new one, I'll seek out another copper/brass fabricator. 3 years and counting. Thomas |
Originally Posted by outbackgeorgia
(Post 10529498)
I have a 928Motorsports radiator, been on the car for over 5 years, no issues. Runs cooler, fits perfectly.
Keeping the Behr just in case,needs tank seals. The welds are beautiful, really a work of art. Don't know who is building them for Carl, but they are great so far. Dave |
Originally Posted by MjRocket
(Post 10529076)
928motorsporsts sells an aftermarket full aluminum radiator,
MJ They were a failwhale of a radiator in the 928 chassis. BUY STOCK, PERIOD. Im one of the guys that lost $1k to aftermarket. No foul on Mark..he learned from it too. |
What causes the main points of failure? bad welds? or the movement of the chassis v movement or non movement of the rad? improper sizing?
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Originally Posted by Dictys
(Post 10529766)
What causes the main points of failure? bad welds? or the movement of the chassis v movement or non movement of the rad? improper sizing?
It will be asked to shift ever do slightly into a parallelogram over and over. Leaks begin on the weld joints at the corners front and back, top and bottom, at the edges of the core to end tank welds then spread to the center. It will only leak under pressure when the micro fractures are expanded. Ancient solidified upper and lower radiator mount bumpers contribute to this IMHO, but new ones still won't fully resolve it. MORE failed than survived. Some got better workmanship in critical areas through luck. The end tank seal, is flexible. The tanks are not part of the core as a single structural unit. |
Originally Posted by ROG100
(Post 10529151)
Jim I see nothing wrong in trying an aftermarket radiator as long as you are prepared to take the rough with the smooth while you play guinea pig. In fact this is how any us of find out if an alternative works or not.
They say exact fit so worth a try - if it does not fit I am sure you can get your money back. I am assuming your car does not have either the engine oil cooler or the transmission cooler. Let us know how it works out. Hopefully they have something for cars with coolers as this radiator will only fit a few of the 928 models.:thumbsup: At this point I merely surmise that I might have some flow issues effecting the cooling efficiency thus why I have started the search for alternatives. |
IIRC the replacement Behr for the early 78/79 cars is now the twin cooler 928 106 040 02. In fact the twin cooler radiator is now the only choice for all cars 78 to 86 with or without engine and transmission coolers. Later radiators do not have the mounting points on the end tanks to support the fan shroud.
78 to 86 twin cooler with shroud support – 928 106 040 02 (51) 87 to 89 engine cooler – 928 106 044 01 (30) 87 to 89 engine & transmission coolers – 928 106 043 01 (23) 90 to 95 no coolers – 928 106 023 20 (51) 90 to 95 transmission cooler – 928 106 042 03 (57) Parentheses = Number in stock at Porsche today. Porsche prices significantly higher than the wholesale market. Total of all part numbers at USA wholesalers – less than 10 The best radiator for production at Behr is 928 106 040 02 as it fits all applications. I will try and get them to consider keeping this one in production. |
Originally Posted by Speedtoys
(Post 10529795)
Thin core material that can't handle the flex in the chassis that the radiator encounters. It will be asked to shift ever do slightly into a parallelogram over and over.
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The aluminum rads are still for sale on Carl's website as a special order item. Don't believe everything you read online?
I'm inclined to trust Carl because he runs his stuff flat out in crazy conditions. That suggests to me it can handle some abuse. I'm curious though whether the cracking issues with aluminum radiators occur in all 928 years, or just with OBs, etc. as far as I can tell, pretty much everyone with one of Carl's rads has been happy with them. Need to redo my searches though to be sure that's true! The stock radiator also has flexible rubber mounts where it attaches to the body. Does the aluminum radiator eliminate those? I'm about to order a radiator, so keeping an eye on this for sure. |
Originally Posted by ROG100
(Post 10529990)
IIRC the replacement Behr for the early 78/79 cars is now the twin cooler 928 106 040 02. In fact the twin cooler radiator is now the only choice for all cars 78 to 86 with or without engine and transmission coolers. Later radiators do not have the mounting points on the end tanks to support the fan shroud.
78 to 86 twin cooler with shroud support – 928 106 040 02 (51) 87 to 89 engine cooler – 928 106 044 01 (30) 87 to 89 engine & transmission coolers – 928 106 043 01 (23) 90 to 95 no coolers – 928 106 023 20 (51) 90 to 95 transmission cooler – 928 106 042 03 (57) Parentheses = Number in stock at Porsche today. Porsche prices significantly higher than the wholesale market. Total of all part numbers at USA wholesalers – less than 10 The best radiator for production at Behr is 928 106 040 02 as it fits all applications. I will try and get them to consider keeping this one in production. |
Running on the bottom line sounds like thermostat isn't working right.
Is it really true radiator design hasn't improved in 30 years or so? |
I'm curious as this info states twin coolers up to the 86, however I have an 87s4 and mine has both the trans and oil cooler in rad...am I missing something?? |
I'm curious though whether the cracking issues with aluminum radiators occur in all 928 years, or just with OBs, etc. as far as I can tell, pretty much everyone with one of Carl's rads has been happy with them. Need to redo my searches though to be sure that's true! I believe Mark had the same issues - all years Carl was selling Mark's rads up until about two years ago - approx. Carl now sells a new rad - time will tell like the others. None of these companies made the radiator they were purchased from a radiator manufacturer. |
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